Issue 44, 2016

125Te NMR provides evidence of autoassociation of organo-ditellurides in solution

Abstract

The frequency of the resonance of 125Te of two organo-ditellurides, R–Te–Te–R (R = 4-CH3C6H4 and 2-(CH3)2NCH2C6H4), in solution undergoes a low-field shift as the concentration of the sample increases. In sharp contrast, the resonance of a sterically hindered ditelluride (R = (C6H5(CH3)2Si)3C) and telluric acid display the opposite effect. While the negative concentration coefficients can be explained by the change in magnetic susceptibility, the positive coefficients are consistent with autoassociation of the molecules through tellurium-centred supramolecular interactions. Although the corresponding equilibrium constants are small, the process is shown to be exothermic. However, the influence of autoassociation is much smaller than the effects of solvent polarity and the conformation of the ditelluride bond.

Graphical abstract: 125Te NMR provides evidence of autoassociation of organo-ditellurides in solution

Supplementary files

Article information

Article type
Paper
Submitted
25 Aug 2016
Accepted
11 Oct 2016
First published
13 Oct 2016
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2016,18, 30740-30747

125Te NMR provides evidence of autoassociation of organo-ditellurides in solution

P. J. W. Elder and I. Vargas-Baca, Phys. Chem. Chem. Phys., 2016, 18, 30740 DOI: 10.1039/C6CP05892B

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party commercial publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements